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Linux/include/linux/page_ext.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __LINUX_PAGE_EXT_H
  3 #define __LINUX_PAGE_EXT_H
  4 
  5 #include <linux/types.h>
  6 #include <linux/stacktrace.h>
  7 #include <linux/stackdepot.h>
  8 
  9 struct pglist_data;
 10 struct page_ext_operations {
 11         size_t offset;
 12         size_t size;
 13         bool (*need)(void);
 14         void (*init)(void);
 15 };
 16 
 17 #ifdef CONFIG_PAGE_EXTENSION
 18 
 19 enum page_ext_flags {
 20         PAGE_EXT_DEBUG_GUARD,
 21         PAGE_EXT_OWNER,
 22 #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
 23         PAGE_EXT_YOUNG,
 24         PAGE_EXT_IDLE,
 25 #endif
 26 };
 27 
 28 /*
 29  * Page Extension can be considered as an extended mem_map.
 30  * A page_ext page is associated with every page descriptor. The
 31  * page_ext helps us add more information about the page.
 32  * All page_ext are allocated at boot or memory hotplug event,
 33  * then the page_ext for pfn always exists.
 34  */
 35 struct page_ext {
 36         unsigned long flags;
 37 };
 38 
 39 extern void pgdat_page_ext_init(struct pglist_data *pgdat);
 40 
 41 #ifdef CONFIG_SPARSEMEM
 42 static inline void page_ext_init_flatmem(void)
 43 {
 44 }
 45 extern void page_ext_init(void);
 46 #else
 47 extern void page_ext_init_flatmem(void);
 48 static inline void page_ext_init(void)
 49 {
 50 }
 51 #endif
 52 
 53 struct page_ext *lookup_page_ext(const struct page *page);
 54 
 55 #else /* !CONFIG_PAGE_EXTENSION */
 56 struct page_ext;
 57 
 58 static inline void pgdat_page_ext_init(struct pglist_data *pgdat)
 59 {
 60 }
 61 
 62 static inline struct page_ext *lookup_page_ext(const struct page *page)
 63 {
 64         return NULL;
 65 }
 66 
 67 static inline void page_ext_init(void)
 68 {
 69 }
 70 
 71 static inline void page_ext_init_flatmem(void)
 72 {
 73 }
 74 #endif /* CONFIG_PAGE_EXTENSION */
 75 #endif /* __LINUX_PAGE_EXT_H */
 76 

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